Biodiversity indices developed have been used to find plant biodiversity index, bird biodiversity index and
aquatic biodiversity index, independently. However, a single index is not available to represent biological environment in
a nutshell, which can represent aquatic biodiversity, plant biodiversity and bird biodiversity index. Moreover, in
development of these indices, Crisp Set Theory has been used, which deals with standing boundary conditions. In present
paper, an attempt has been made to develop single index, which can represent biological environment at a glance, by
using fuzzy set theory.